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Abstract
The flow of water within a pipeline system causes loss of energy due to friction effects.
To overcome these losses, energy is added to the water through the pump. So, the right pump
selection is important for providing the required flow rate. The first step to select a right pump
for any pipeline system is calculating the performance curve of piping system, which is a
graphical representation of the energy required to move a given flow rate through a piping
system and is used to identify the characteristics of the system's pump. For this purpose, the
system curve for the water pipeline connecting the main reservoirs of Zawia desalination plant to
the sub-tanks in Harsha has been evaluated and represented graphically in H-Q curve of the
selected pump. This water pipeline network consists of sets of pipes connected in parallel and
series with a total length of 5 km. The system NPSHA at different water levels in the suction
tank at the maximum system flow rate of 800 (m3/hr) has been calculated to ensure avoiding
cavitations problem in the selected pump.